EP0903502A1 - Verriegelbarer und entriegelbarer Zylinder - Google Patents

Verriegelbarer und entriegelbarer Zylinder Download PDF

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Publication number
EP0903502A1
EP0903502A1 EP98410104A EP98410104A EP0903502A1 EP 0903502 A1 EP0903502 A1 EP 0903502A1 EP 98410104 A EP98410104 A EP 98410104A EP 98410104 A EP98410104 A EP 98410104A EP 0903502 A1 EP0903502 A1 EP 0903502A1
Authority
EP
European Patent Office
Prior art keywords
piston
cylinder
rod
locking
action
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98410104A
Other languages
English (en)
French (fr)
Inventor
Bernard Contat
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Contat Freres Ets
Original Assignee
Contat Freres Ets
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from FR9711914A external-priority patent/FR2775029A1/fr
Application filed by Contat Freres Ets filed Critical Contat Freres Ets
Publication of EP0903502A1 publication Critical patent/EP0903502A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/26—Locking mechanisms

Definitions

  • the present invention relates to a control cylinder and more particularly an improvement for a jack according to which the extreme positions of the piston are automatically locked, and can be unlocked manually or automatically.
  • the present invention aims to solve the above problems using simple, inexpensive and reliable means. It provides a cylinder that can be locked in its positions and which can be unlocked in the event of a breakdown manually easily.
  • the jack according to the invention is of the type comprising a jack body consisting of a peripheral wall forming a jack chamber in which at least one will move piston secured to a piston rod and is characterized in that the cylinder includes locking means for locking the piston assembly with its stem in at least one of its extreme positions, said locking takes place under the action of the piston automatically.
  • the means of locking include locking members intended to cooperate with at least one piston rod locking groove.
  • the locking members consist of balls arranged annularly around the piston rod in ball housings an end piece integral with the body of the jack, said balls undergoing a radial movement to cooperate with a locking groove of the rod under the action of a bearing surface of the piston when the assembly piston (s) - piston rod (s) reaches an extreme position.
  • the locking means make it possible to lock the two positions extremes of the piston assembly with its rod, said cylinder comprising two pistons movable towards each other against the action of elastic means of return such as a spring, the pistons thus being biased apart against, respectively, two stops, while the piston rod includes two locking grooves in which are housed respectively a set of associated locking balls.
  • the one or more pistons are movably arranged longitudinally on the rod piston, the manual unlocking means comprising at least one control member intended to cause longitudinal displacement of the piston or pistons by means of connection means.
  • the member (s) of control consist of two release rings arranged at the outside and at each end of the cylinder body, each of the rings can be rotated by manual user action, while the rotation of one or other of the release rings causes the corresponding piston to move by the action of connecting means constituted by release pushers which force the piston to unlock against the action of the spring, said pushers being moved along their axes by means of a return screw actuated by the rotation of the corresponding unlocking ring.
  • the dimensions of the constituent parts of the locking means and of the unlocking are chosen so that unlocking the piston (s) - piston rod (s) assembly requires angle rotation between 0 ° and 180 °.
  • the unlocking rings have a torsion spring to bring the ring back into its initial position after actuation.
  • the jack is of the type pneumatic, the passage of compressed air taking place in one or several hollow tubes of the jack body, said tubes being arranged longitudinally along the cylinder chamber.
  • Figures 1 to 6d illustrate the preferred embodiment of the cylinder according to the invention and its locking means and unlocking.
  • Figure 1 shows in side view the cylinder as a whole.
  • Figure 2 illustrates in longitudinal half-section the cylinder.
  • FIG. 3a represents the piston body of one of the pistons in longitudinal section.
  • Figure 3b illustrates in longitudinal section the assembly piston rod pistons.
  • Figure 4 illustrates in longitudinal half-section the means of unlocking of the piston and its rod.
  • Figure 5 illustrates in cross section the cylinder body.
  • FIGS 6a to 6d schematically illustrate the unlocking of the piston-rod assembly.
  • Figure 6a shows schematically the locked position of the piston and its rod.
  • FIG. 6b represents the displacement of the piston under the action of unlocking means.
  • Figure 6c illustrates the output of the rod locking member piston.
  • Figure 6d shows the displacement of the rod leaving its extreme position.
  • the jack according to the invention bearing the general reference (1) comprises a jack body (2) consisting of a peripheral wall (3) forming a cylinder chamber (4) in which at least one piston (5) integral with a piston rod (6).
  • the cylinder comprises locking means (MV) to lock the piston assembly (5) with its rod (6) in its two extreme positions. Note that locking in both positions advantageously takes place by the piston itself, so automatic.
  • this is of pneumatic type, the piston (5) being biased in displacement by the presence of compressed air in one or other of the parts of the cylinder chamber (4) which it delimits during its displacement. It goes without saying that the locking device and unlocking the cylinder could be fitted to a hydraulic type cylinder or other without departing from the scope of the invention.
  • the locking means (MV) are constituted by locking members (11a, 11b) intended to cooperate with a groove locking (10a, 10b) of the piston rod (6) when it arrives in an extreme position so as to block said rod.
  • the piston rod (6) comprises two locking grooves (10a, 10b) intended to allow locking in each of the two positions extremes.
  • the locking members are advantageously made up by two sets of locking balls (11a, 11b) which come respectively be housed in the respective locking grooves (11a, 11b) when the piston-piston rod assembly is in one of the two extreme positions.
  • the first set of locking balls (11a) advantageously comprises four balls arranged on a front end piece (15a), the balls (11b) of the second together being arranged respectively on a rear end piece (15b).
  • the rear end piece (15b) has an internal bore (13) in which slides the piston rod along its longitudinal axis (ZZ '), the balls (11b) being arranged annularly in ball housing of the wall annular peripheral of the bore at the front end of the end piece, said balls being able to move radially to be housed in the groove (10b) for locking the rod (6).
  • the front end piece (15a) has a cylindrical hollow housing (16) at its rear end in which the end of the piston rod (6) is received, the balls (11a) of the first set being arranged annularly in the wall peripheral of said housing so as to be able to move radially to ensure the locking position of the piston rod by cooperating with the locking groove (10a).
  • sets of locking balls could have a number of different balls such as two diametrically opposite balls without departing from the claimed protective fields of the invention.
  • the jack (1) comprises two pistons (5a, 5b) carried by the piston rod (6) and which each have a bearing surface constituted by the internal peripheral wall (17) of a bore (30) located respectively at their front or rear end, as shown in Figures 3a and 3b, said surface being intended to cooperate with the balls (11a, 11b) to cause their movement radial towards the groove of the piston rod.
  • the balls (11a) are held by the bearing surface (17) of the first piston (5a) in the groove (10a) of the piston rod (6) when the piston-rod assembly of pistons is in one of the extreme positions, the rod and its pistons being thus locked. Note that in the other extreme position, the locking is similarly secured by the second piston (5b), the second groove (10b) and the second set of balls (11b).
  • the two pistons (5a, 5b) are movable in sliding towards each other along the longitudinal axis (ZZ ') of the piston rod against the action of elastic return means, such as for example a spring (8) disposed between them.
  • elastic return means such as for example a spring (8) disposed between them.
  • the two pistons (5a, 5b) being thus urged in spacing against, respectively, two stops (9a, 9b) on which a front wall of the front piston (5a) and a rear wall of the rear piston (5b) are supported when the assembly piston-piston rod is unlocked, i.e. in one position called initial position, as shown in Figure 3b, said walls front and rear which may be constituted by the end wall (36) of the bore (30). Therefore, when the cylinder is in the locked position as as illustrated in FIG.
  • the pneumatic pressure introduced causes the longitudinal displacement of the piston (5a) against the action of the spring (8) until the bearing surface (17) of the piston (5a) no longer cooperates with the locking members (11a) which are released, thereby unlocking the cylinder, the two pistons (5a, 5b) then returning to their position initial.
  • the locking grooves (10a, 10b) of the rod piston (6) comprise an inclined annular ramp or chamfer (20), as shown in Figure 3b.
  • the jack comprises means for manual unlocking (MDV) consisting of control elements (7a, 7b) intended to cause the longitudinal displacement of the one or more piston (s) (5, 5a, 5b) as previously described using means of connection such as release pushers (21) as shown in the figure 4.
  • MDV manual unlocking
  • the control elements are made up by two pivoting unlocking rings (7a, 7b) arranged at outside and at each end of the cylinder body (2).
  • Each of rings (7a, 7b) can be rotated by manual action of the user.
  • the rotation of one or other of the unlocking rings causes the displacement of the corresponding piston (5a, 5b) by action of unlocking pushers (21) which force the piston to unlock against the action of the spring (8), said pushers being moved according to their longitudinal axis by means of a return screw (23) actuated by rotation of the corresponding release ring.
  • the rotation of the ring (7a) causes in a manner known per se, as for example by cooperation of an internal thread (35a) of the ring and an external thread (35b) of the return screw, the displacement of the screw return (23) along the longitudinal axis (ZZ '), which causes the displacement of the release pushers (21) according to F1 as the shows figure 6b and therefore the unlocking of the piston (5a) by release of the locking members (11a) as illustrated in FIG. 6c.
  • the unlocked piston rod moves according to F2 and thus allows the piston-piston assembly to return to its original position during its longitudinal displacement as shown in Figure 6d.
  • the cylinder has two end stops (50a, 50b) secured respectively to the rear and front end pieces (15a, 15b) of so as to block the unlocking rings longitudinally.
  • the jack (1) has two pushers (21) each of its ends, arranged diametrically opposite by relative to the axis (ZZ ') and parallel to this, said pushers being in stop on the front and rear ends (19a, 19b) of the respective pistons (5a, 5b).
  • the piston rod (6) has a central stop (12) located between the stops (9a, 9b) and which is arranged between the two pistons (5a, 5b) to limit their stroke in reconciliation.
  • the dimensioning of the various constituent bodies of the means of locking (MV) and manual unlocking means (MDV) such that the release rings (7a, 7b), the pistons (5a, 5b), the spring (8), the return screws (23) or the release buttons (21) by example, so that the rotation of the ring required when the piston is unlocked, its angle is between 0 ° and 180 ° and advantageously equal to 120 °.
  • the amplitude of the rotation of the ring could be different, without going outside the scope of protection of the invention; similarly, the control members or the linkage of manual unlocking means (MDV) could be replaced by equivalent means.
  • the unlocking rings (7a, 7b) are advantageously provided with a torsion spring (22) intended to cause the reverse rotation of the release ring to return it to its original position as well that the return screws (23) and the release pushers (21) which are linked.
  • the rings of release (7a, 7b) are arranged at each end of the actuator so as to be able to pivot around the longitudinal axis (ZZ ') of said cylinder.
  • the passage of the compressed air from the pneumatic cylinder (1) can take place along the cylinder in one or more hollow cylindrical tubes (14) of the cylinder body (2) arranged outside the chamber (4).
  • the tubes (14) are at number of four and advantageously allow the passage compressed air and secondly the attachment of the front and rear end caps (15a, 15b) by means of connecting screws (26a, 26b), some of which (26b) can be partially drilled to allow said passage of compressed air as shown in Figure 2.
  • a passage (25) connects the tube (14) to the front end of the cylinder chamber (4) so that compressed air can be introduced into it.
  • the actuator could include locking means for only one of its extreme positions and does not include a movable piston and its unlocking means associated, without departing from the claimed protective field of the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
EP98410104A 1997-09-18 1998-09-17 Verriegelbarer und entriegelbarer Zylinder Withdrawn EP0903502A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR9711914 1997-09-18
FR9711914A FR2775029A1 (fr) 1997-09-18 1997-09-18 Verin a verrouillage et de deverrouillage
FR9714805 1997-11-20
FR9714805A FR2775030B1 (fr) 1997-09-18 1997-11-20 Verin a verrouillage et de deverrouillage

Publications (1)

Publication Number Publication Date
EP0903502A1 true EP0903502A1 (de) 1999-03-24

Family

ID=26233819

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98410104A Withdrawn EP0903502A1 (de) 1997-09-18 1998-09-17 Verriegelbarer und entriegelbarer Zylinder

Country Status (3)

Country Link
US (1) US6164186A (de)
EP (1) EP0903502A1 (de)
FR (1) FR2775030B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007084018A1 (en) * 2006-01-23 2007-07-26 'rewa' Sp. Z O.O. Pneumatic-and-hydraulic cylinder with piston rod interlock
EP3184437A1 (de) * 2015-12-22 2017-06-28 Hamilton Sundstrand Corporation Entriegelungsmechanismus für eine stauluftturbine aktuator

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10343714B4 (de) * 2003-09-20 2005-12-08 Niemann, Wolfgang, Dipl.-Ing. Verriegelbarer Pneumatikzylinder

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR47260E (fr) * 1936-04-10 1937-03-05 Elektronmetall Gmbh Entretoise de longueur variable pour avions
US2434828A (en) * 1944-11-10 1948-01-20 Electrol Inc Piston locking means for fluid actuated jacks
DE2143712A1 (de) * 1971-09-01 1973-03-08 Westinghouse Bremsen Apparate Druckmittelbetaetigbarer arbeitszylinder mit endstellungsarretierung
FR2534985A3 (fr) * 1982-10-23 1984-04-27 Messerschmitt Boelkow Blohm Verin a blocage perfectionne

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2655058A (en) * 1951-03-07 1953-10-13 Rockwell Mfg Co Power feed mechanism
FR2231873A1 (en) * 1973-06-04 1974-12-27 Perrier & Ses Fils Jack with two-way adjustable piston travel - has hollow piston rod with two rotatable threaded adjusters
GB2003985B (en) * 1977-09-08 1982-03-24 Messier Hispano Sa Operating and bracing jack having an internal locking mechanism
US4240332A (en) * 1978-08-25 1980-12-23 Arkwin Industries, Inc. Fluid operated locking actuator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR47260E (fr) * 1936-04-10 1937-03-05 Elektronmetall Gmbh Entretoise de longueur variable pour avions
US2434828A (en) * 1944-11-10 1948-01-20 Electrol Inc Piston locking means for fluid actuated jacks
DE2143712A1 (de) * 1971-09-01 1973-03-08 Westinghouse Bremsen Apparate Druckmittelbetaetigbarer arbeitszylinder mit endstellungsarretierung
FR2534985A3 (fr) * 1982-10-23 1984-04-27 Messerschmitt Boelkow Blohm Verin a blocage perfectionne

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007084018A1 (en) * 2006-01-23 2007-07-26 'rewa' Sp. Z O.O. Pneumatic-and-hydraulic cylinder with piston rod interlock
EP3184437A1 (de) * 2015-12-22 2017-06-28 Hamilton Sundstrand Corporation Entriegelungsmechanismus für eine stauluftturbine aktuator

Also Published As

Publication number Publication date
FR2775030A1 (fr) 1999-08-20
FR2775030B1 (fr) 2000-06-02
US6164186A (en) 2000-12-26

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